HI Home Seller,
Its hard to answer that question with the information you've given, it depends so much on where your home is located and many other factors, such as how does your home's age, condition, size, and location compare with other homes for sale in your neighborhood. Has it been shown a lot? If it has, then there's buyers in your area for a home in that price range. You may want to look for other reasons, feedback from the showing agents, etc to see why its being shown but no offers. If you've had few or no showings, then that tells you a number of things. Either there's no buyers looking in that range in your area, or there's something that stands out immediately about your home, price or location that's keeping buyers from even looking.
I would add that the price range of $450k is not necessarily in the range of the homes that have been flying off the market with multiple offers lately, so your expectations may have been set too high. A few weeks is not necessarily a long time in the big picture.
Here's 2 suggestions I would make: have you visited other homes for sale in the same price range in your area? Its a great way to see for yourself, what others see. If you can put yourself in the shoes of a buyer (sometimes hard when you're the owner of the home) but it can be helpful to see what else is out there. Ask your Realtor to do weekly reports for you, of what has gone pending. That will show you what others are buying in your general location and you should be able to see patterns emerge. Is everything that's pending, much less than your home? Doesn't mean yours is overpriced but that it may just take longer to sell. What else do the pendings say to you? Maybe drive by a few of them, and see what is attracting buyers in your area. If none are pending, then you have your answer, there's not a lot of buyers for your price range and you'll need to be more patient.
Just some thoughts... wish you the best!